The Discovery and Mass Measurement of a New Ultra-short-period Planet: K2-131b
Journal
Date Issued
2017
Author(s)
Dai, Fei
•
Winn, Joshua N.
•
Gandolfi, Davide
•
Wang, Sharon X.
•
Teske, Johanna K.
•
Burt, Jennifer
•
Albrecht, Simon
•
Barragán, Oscar
•
Cochran, William D.
•
Endl, Michael
•
Fridlund, Malcolm
•
Hatzes, Artie P.
•
Hirano, Teruyuki
•
Hirsch, Lea A.
•
Johnson, Marshall C.
•
Bo Justesen, Anders
•
Livingston, John
•
Persson, Carina M.
•
Prieto-Arranz, Jorge
•
Vanderburg, Andrew
•
Alonso, Roi
•
Antoniciello, Giuliano
•
Arriagada, Pamela
•
Butler, R. P.
•
Cabrera, Juan
•
Crane, Jeffrey D.
•
•
Csizmadia, Szilárd
•
Deeg, Hans
•
Dieterich, Sergio B.
•
Eigmüller, Philipp
•
Erikson, Anders
•
Everett, Mark E.
•
Fukui, Akihiko
•
Grziwa, Sascha
•
Guenther, Eike W.
•
Henry, Gregory W.
•
Howell, Steve B.
•
Johnson, John Asher
•
Korth, Judith
•
Kuzuhara, Masayuki
•
Narita, Norio
•
Nespral, David
•
Nowak, Grzegorz
•
Palle, Enric
•
Pätzold, Martin
•
Rauer, Heike
•
Rodríguez, Pilar Montañés
•
Shectman, Stephen A.
•
Smith, Alexis M. S.
•
Thompson, Ian B.
•
Eylen, Vincent Van
•
Williamson, Michael W.
•
Wittenmyer, Robert A.
Abstract
We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, K2-131b, was discovered in K2 Campaign 10. It has a radius of 1.81-0.12+0.16 R\oplus and orbits a G dwarf with a period of 8.9 hr. Radial velocities obtained with Magellan/PFS and TNG/HARPS-N show evidence for stellar activity along with orbital motion. We determined the planetary mass using two different methods: (1) the "floating chunk offset" method, based only on changes in velocity observed on the same night; and (2) a Gaussian process regression based on both the radial velocity and photometric time series. The results are consistent and lead to a mass measurement of 6.5± 1.6 M\oplus and a mean density of 6.0-2.7+3.0 g cm-3.
Volume
154
Issue
6
Start page
226
Issn Identifier
0004-6256
Ads BibCode
2017AJ....154..226D
Rights
open.access
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